Tool-holder.



No. 687,645.. i Patented Nov. 26,1901.

` F. S. MITCHELL. TO0L HULDER.

' (Appliation led Jfuly 12, 1901.1

v Y@ :E25

.(-Ilo Model.)

2o of the tool-holder.

UNITED STATES FRANK S. MITCHELL, OF WHEELING,

lPATENT OEEIcE.

WEST VIRGINIA, ASSIGNOR OF ONE- TOOL-HOLDER.

SPECIFICATION forming' part 0f Letters Patent No. 687,645, datedNovember 26, 1901.

Application filed July 12, 1901. Serial No. 68,082. (No model.)

Virginia, have invented new and useful Improvements in Tool-Holders, ofwhich the following is a specification.

n My invention relates to improvements in tbol-holders which are for usein connec- 1o tion with lathes, and particularly pertains to means forpreventing the tool-holder from rotating when the tool is clampedtherein for operation.

In the accompanying drawings, Figure l is vertical central sectionalView of a tool-holder embodying my invention. Fig. 2 is an elevation ofthe same, taken at right angles to Fig. l. Fig. 3 is a detached View ofthe lower end of the tool-holder. Fig. 3? is a top plan view Fig. 4. isa top plan view of the coacting locking member for the toolholder. Fig.5 is a sectional View on the line 5 5 of Fig. 4.

Though the speciic construction employed to carry out this invention mayvary without departing from the spirit and scope of my invention, I hereshow one Way of preventing the rotation of the tool-holder when the toolis clamped therein for use.v

Referring now to the accompanying drawings, A is the tool-rest, and athe tool-post. The tool-rest A is provided with the verticallyarrangedopening a', through which the lower end of the tool-post a extends. Thelower end of this opening a/ is enlarged laterally, as

shown at a", and preferably contains a coacting locking block or'memberB. This member B, as shown in Fig. 4., is angular, and the enlargedportion a2 is made to correspond 4o with the member or block B and isadapted to hold it against rotation in respect to the tool-rest A.

The lower extremity of the tool-post a is provided with alaterally-projecting flange d,

which is provided with a plurality -of locking shoulders or se'rrationsZJ, with which corresponding locking shoulders or serrations c, formedupon an inwardly-extending flange b of the locking-block B, engage andby means 5o of which when the locking-shoulders are in engagement thetool-post a is held against rotary movement when in use.

A vertically-arranged slot M is made in the tool-post and is adapted toreceive the tool E. Surrounding the lower portion of the toolpost andresting upon the tool-rest A is a suitable block or member C, and thisblock or member C is provided in its upper face with a concaved recessH, in which rests the member D, having its lower face convexed tocorrespond with the concaved recess H and to support the tool E. Passingthrough the upper end of the tool-post a. is the tool-clamping screw I,by means of which the tool is clamped and held when being used.

The tool-post a. has a vertical movement in respect to the tool-rest,and it is this vertical movement under the clamping action of the screwI that causes the locking shoulders or serrations b and c to engage.

When the tool is placed in position within the tool-post a and thetool-holder turned to the desired position for holding the tool asdesired by the operator, the clamping of the tool through the medium ofthe clampingscrew I elevates the tool-post a and causes, as just stated,the engagement of the lockingshoulders upon the lower end of thetool-post and the coacting locking member B.

Though I have described the use of the locking member B and a specificconstruction whereby the clamping of the tool will automatically lockthe tool-post against rotation, this species may be varied withoutdeparting from my invention.

Having thus explained the nature of my invention and described one Wayof constructing and using the same, but without attempting to set forthall the forms in which it may be made or used, what I claim, and desireto secure by Letters Patent, is

1. A tool-holder comprising a tool-support having a tool-post-receivingopening, a toolpost having a movable head located in said opening, thehead and the Wall of the opening having interlocking members to preventa rotation of the post, and a clamping member adapted to cause anengagement of said interlocking members.

2. A tool-holder comprising a support having a tool-post-receivingopening with an enlarged lower end, a longitudinally-movable tool-posthaving an enlarged lower end located in said opening, the adjacent wallsof the IOO opening and the lower end of the post having laterali-yiarranged locking members, Vand meansior moving the postvertically tocause the engagement of said locking members.

3. A tool-holder comprising a support having a tool-post opening, a longitudinally-mov-V able tool-post located therein the post and the wallofthe opening having locking members, the post having a longitudinallyarranged tool-receiving slot, a tool therein supported by said support,and a clamp adapted to force the tool against the support and move thepost to cause an engagement ot said lockingV clamp adapted to move thepost and cause an engagement ofsaid locking members.

5. A tool-holder comprising a support havinga tool-post opening with anenlarged lower end, a locking member located in said enlarged endv andheld against rotation therein, saidjlocking` nrember'hgaving a'tool-postopening, a longitudinally-movable tool-post located therein, the postand locking member having coacting locking-serrations, and a toolclampadapted to move the post and cause an engagement of saidlocking-serrations.

In testimony whereof I have hereunto set m-yhand in the presence of twosubscribing witnesses.

F; S. MITCHELL.

i/Vitnesses: l

M. V. BLUE, W. V. HOGE, Jr.

